Oil burner tip



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G. J. HOLTHAM New, 5, 1%35 OIL BURNER TIP Filed Aug. 5, 1935 INVENTOR B FEE/Q40 J #04. 7774M :2 ATTORNEY Patented Nov. 5, 1935 UNITED STATE PATENT OFFIE 4 Claims.

My invention relates to an oil burner tip, and the objects of my invention are:

First, to provide a burner of this class which does not carbonize or otherwise become clogged with the formation of carbon around the oil discharge orifice;

Second, to provide an oil burner tip in which the quantity and pressure of air required to provide complete combustion is reducedto a minimum, there being a complete and intimate mixture of air and oil;

Third, to provide an oil burner tip which may be installed without altering the other portions of the conventional burner with which it is used;

Fourth, to provide an oil burner tip whichis particularly easy to assemble and disassemble, the parts being few in number and having only a single connection holding the several parts in position;

Fifth, to provide an oil burner tip which incorporates a novel means of causing the oil to swirl or rotate as it passes through and issues from its orifice so as to effect a particularly complete atomization of the oil;

5 Sixth, to provide an oil burner wherein radially and forwardly directed jets of airare introduced into the swirling and atomized oil as it issues from its orifice so that there is formed an intimate mixture of atomized air and oil, there being provided a novel means of collecting and directing the air to produce the above-mentioned jets; and

Seventh, to provide on the whole a novelly constructed oil burner tip which is particularly compact, efficient in its action, durable, simple and economical of manufacture, and which will not readily deteriorate or get out of order.

With these and other objects in view as will appear hereinafter, my invention consists of certain novel features of construction, combination, and arrangement of parts and portions as will be hereinafter described in detail and particularly set forth in the appended claims, reference being had to the accompanying drawing and to the characters of reference thereon which form a part of this application in which:

Figure 1 is a front elevational view of my oil burner tip; Fig. 2 is a side elevational view thereof Fig. 3 is a longitudinal sectional view thereof taken through 3-3 of Fig. 1; Fig. 4 is a transverse sectional view taken substantially through 4-4 of Fig. 3 with parts and portions shown in elevation to facilitate the illustration; Fig. 5 is 55 another transverse sectional view taken through 55 of Fig. 3; and Fig. 6 is a front elevational view of the control plug.

Similar characters of reference refer to similar parts and portions throughout the several views of the drawing.

A conventional fuel conduit or pipe I is provided which has a screw threaded extremity and is adapted to receive one end of a coupling 2. The coupling 2' is provided with a bore 2a therethrough which is internally threaded at one end 10 to receive the end of the pipe I.

The forward end of the coupling 2 is provided with an externally threaded portion 2b which is slightly less indiameter than the normal diameter of the coupling. The screw threaded por- 15 tion 222 forms with the remainder of the coupling a shoulder against which fits a gasket 3. The screw threaded portion Zb-is adapted to receive a body member 4, said body member being provided with an internally threaded hollow portion designated M at its rear end. The body member 4 has a fluid tight connection with the. coupling ,2. Forwardly of the coupling 2 the body member is provided with a conical chamber to with its apex pointed forwardly in axial alinement with 25 the coupling and having an oil discharge orifice 40 therein. The conical chamber is adapted to receive a control plug. 5 which is frusto-conical in form and has side walls which converge in conformity with the converging walls of the cham- 30 ber ib and seat therein. There are formed in the converging walls of the metering valve a plurality of helically wound grooves or channels 5a. The channels spiral in the same direction and are equally spaced, and form with the con- 35 verging walls of the chamber 4b a plurality of conduits or passages for the oil. The oil pressure within the bore 2a and rear end of. the chamber 412 is sufficient to hold the control plug in its properposition against the converging walls of the chamber 41).

The oil discharge orifice ic. terminates flush Wlllh'Ol slightly rearwardly of the normally forward face of the body member. Said body member is provided with a substantially frusto-conical recess or port 4d cut into its forward end around the orifice 40 so that said orifice is located at the apex of a small tip or cone, designated ie. The base of the recess 4d surrounding the cone tip 4c is intersected by a plurality of passages 4 These passages intersect the recess 401 in adjacent relation with each other as shown best in Fig. 5, and extend rearwardly therefrom in diverging relation to the outer periphery of the body member mtermediate its ends. Immediately forward of it issues therefrom, it is swirling rapidly. The

small tip designated 47 of the chamber 411 facilitates the transfer of the whirling oil from the metering valve to the orifice 4c. The oil issuing from the orifice 4c tends to draw air through the passages M. In addition the air is introduced forcefully through the passages 4 by reason of the flow of air forwardly along the periphery of main portion of the body member and the deflection of such air by the undercut rear side 47!. of the flange 49. In view of the fact that the oil spray tends 'to converge by reason of its rotation and introduction of the converging jets of air, there is a particularly complete and intimate mixture of air and oil which begins from the very tip or orifice 40 itself. The jets of air flowing by the orifice 4c prevent any accumulation of carbon or other deleterious deposits around the orifice. Because of this fact, it has been found through tests that the oil burner tip here illustrated is perfectly clean after thirty-eight (38) hours of operation whereas the other oil burner tips in service today plug tight in less than eight hours and carbon begins to form on the surface within thirty minutes after beginning operation.

It should be here noted that each of the passages 4f taper or reduce their diameters towards their forward extremities. This increases the velocity of air flow .at the discharge end of these passages.

Though I have shown and described a particu lar construction, combination, and arrangement of parts and portions, I do not wish to, be limited to this particular construction, combination, and arrangement, but desire to include in the scope of my invention the construction, combination, and arrangement substatially as set forth in the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In an oil burner tip, a body member having a conical recess therein, and a fuel discharge orifice in the apex thereof, and a frusto-conical control plug positioned in said recess with its side walls fitting therein, said control plug having converging helically directed oil passages extending from the base end of said recess towardv the apex thereof, said body member having a plurality of air passages with their receiving ends intersecting said body member intermediate its ends and converging towards its forward end, the axes of the air passages intersecting at a common point immediately forward of said fuel discharge orifice, said body member having an annular recess common to the forward extremities of said passages, the wall of said recess converging forwardly, anddeflning a cone-shaped tip with the fuel orifice at its apex,

2. In an oil burner tip, a body member of generally cylindrical form provided with a flange intermediate its ends, the rear side of said flange being undercut and said body member provided with a plurality of forwardly converging air passages having their inlet ends intersecting the periphery of said body member immediately rear- Wardly of said flange, said passages extending through said body member and having their axes intersecting at a common point immediately forwardly thereof, and said body member being also provided with a fuel discharge orifice immediately rearwardly of the point of intersection of said passages.

3. In an oil burner tip, a body member of generally cylindrical form provided with a flange intermediate its ends, the rear side of said flange being undercut and said body member being provided with a plurality of forwardly converging air passages having their inlet ends intersecting the periphery of said body member immediately rearwardly of said flange, said passages extending through said body member and having their axes intersecting at a common point immediately forwardly thereof, said body member being also provided with an air discharge port common to the forward ends of said passages, said port having converging walls, and said body member having a conical tip extending into said port in central relation therewith provided with a fuel discharge orifice at its apex.

4. In an oil burner tip, a coupling member.

flange intermediate its ends, the rear side of said flange being undercut, said body member being provided with a plurality of forwardly converging air passages having their inlet ends intersecting the periphery of said body member immediately rearwardly of said flange, said passages extending through said body member and their axes intersecting at a common point immediately forwardly thereof, and said body member being provided with a fuel discharge orifice extending from the apex of said chamber and discharging immediately rearwardly of the point of intersection of the axes of said passages.

GERALD J. HOLTHAM. 

